feat: add initial dashbot package implementation

- Created a new Dashbot package with core functionalities.
- Implemented Dashbot window model and notifier for state management.
- Added UI components including Dashbot default page and home page.
- Integrated routing for Dashbot with initial routes defined.
- Included assets for Dashbot icons and set up pubspec.yaml.
- Added tests for Dashbot window notifier to ensure functionality.
- Established a basic README and CHANGELOG for the package.

packages/dashbot/lib/core/common/pages/dashbot_default_page.dart

@@ -0,0 +1,40 @@
+import 'package:apidash_design_system/apidash_design_system.dart'
+    show kVSpacer20, kVSpacer16, kVSpacer10;
+import 'package:dashbot/core/utils/dashbot_icons.dart';
+import 'package:flutter/material.dart';
+
+class DashbotDefaultPage extends StatelessWidget {
+  const DashbotDefaultPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      crossAxisAlignment: CrossAxisAlignment.center,
+      children: [
+        kVSpacer16,
+        DashbotIcons.getDashbotIcon1(width: 60),
+
+        kVSpacer20,
+        Text(
+          'Hello there!',
+          style: TextStyle(fontSize: 22, fontWeight: FontWeight.w800),
+        ),
+        kVSpacer10,
+        Text(
+          'Request not made yet',
+          textAlign: TextAlign.center,
+          style: TextStyle(
+            fontSize: 14,
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+          ),
+        ),
+        Text(
+          "Why not go ahead and make one?",
+          textAlign: TextAlign.center,
+          style: TextStyle(fontSize: 16, fontWeight: FontWeight.w200),
+        ),
+      ],
+    );
+  }
+}